Attachment for furnaces



y 1, 1930. M. GREENBERG 1,768,684

- ATTACHMENT FbR FURNACES- Filed Feb. 18, 1929 Patented July 1, 1930 UNITED STATES MAX GREENBERG, OF CLEVELAND, OHIO ATTACHMENT FOB FURNACES Application filed February 18, 1929. Serial No. 340,984.

This invention is an attachment for furnaces designed to increase the heating eflect or capacity thereof. It is particularly useful in connection with gas furnaces, but may be used in furnaces of other kinds.

It has been found that the heat delivered by many furnaces, especially those using gas is small in proportion to the amount of gas used, probably because the products of combustion pass too quickly through and out of the fire box.

The present device consists of an attachment in the nature of, a battle, which can be used even in old furnaces, the function of which is to delay the flow of heat somewhat,

with the result that a higher heat effect is obtained on the air which is heated by the furnace.

A further object of the invention is to provide a device of this kind which can be cheaply constructed and quickly and easily in position in the furnace.

In the accompanying drawing Fig. 1 is a perspective view partly broken away of the device attached to the furnace. Fig. 2 is a perspective of the device removed from the furnace. Fig. 3 is a section on the line 33. Fig. 4 is a detail showing the attachment applied to the smoke flue of a furnace.

In the accompanying drawings 6 indicates the casing, 7 the dome of the fire box and 8 the outlet passage or flue leading to the smoke stack. The burners are indicated at 9. These parts may be of any ordinary construction.

The attachment comprises a tapered shell 10 tubular in form and provided at its larger upper end with a flange 11, and having a plurality of perforations 12 in the side wall. At

its lower smaller end the shell supports a conical deflector 13, supported from the shell by straps 14. The deflector is spaced from the lower edge of the shell and the edges of the deflector project upwardly beyond said edges, so that a crooked passage is formed for the flow of the products of combustion over the upper edge of the deflector and under the lower edge of the shell.

The device may be made of such a size that it may be inserted in the outlet opening at the top of the dome, with the flange ll resting on the edge around said dome, and the body of the shell and the deflector depending into the combustion space within the dome.

Or the attachment may be set into the smoke flue at the back of the furnace, as

shown in Fig. 4, and supported therein in any I suitable way.

When in position the effect of the device is to delay the flow of gases from the fire box, to some extent. Said gases pass through the passage between the deflector and the shell and also through the openings 12 in the side of the deflector, the eflect being that more heat is exchanged to the air between the fire box and the casing of the furnace as it passes through the furnace from which it is deliv ered to the room to be heated.

The simplicity of the device is obvious. It can be made of sheet metal and placed in position with little trouble.

'. I claim:

1. The combination with the combustion chamber of a furnace, having an outlet at the top, of an inverted tapered perforated shell depending in said outlet and having an open lower end and a conical deflector under the said end of said shell, the deflector being spaced from the lower end of the shell and projecting outwardly beyond the said end, to form a tortuous passage for products of combustion escaping through said shell.

2. The combination stated in claim 5, the shell having a supporting flange at its upper end resting on the top of the chamber around said outlet.

In testimony whereof, I affix my signature.

MAX GREENBERG. 

